src/metadata/minolta.cpp

/* -*- C++ -*-
 * Copyright 2019-2025 LibRaw LLC (info@libraw.org)
 *
 LibRaw uses code from dcraw.c -- Dave Coffin's raw photo decoder,
 dcraw.c is copyright 1997-2018 by Dave Coffin, dcoffin a cybercom o net.
 LibRaw do not use RESTRICTED code from dcraw.c

 LibRaw is free software; you can redistribute it and/or modify
 it under the terms of the one of two licenses as you choose:

1. GNU LESSER GENERAL PUBLIC LICENSE version 2.1
   (See file LICENSE.LGPL provided in LibRaw distribution archive for details).

2. COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
   (See file LICENSE.CDDL provided in LibRaw distribution archive for details).

 */

#include "third_party/libraw/internal/dcraw_defs.h"

void LibRaw::parse_minolta(INT64 base)
{
  int tag, len, high = 0, wide = 0, i, c;
  short sorder = order;
  INT64 save,offset;

  fseek(ifp, base, SEEK_SET);
  if (fgetc(ifp) || fgetc(ifp) - 'M' || fgetc(ifp) - 'R')
    return;
  order = fgetc(ifp) * 0x101;
  offset = base + get4() + 8;
  INT64 fsize = ifp->size();
  if (offset > fsize - 8LL) // At least 8 bytes for tag/len
    offset = fsize - 8LL;

  while ((save = ftell(ifp)) < offset)
  {
    for (tag = i = 0; i < 4; i++)
      tag = tag << 8 | fgetc(ifp);
    len = get4();
    if (len < 0)
      return; // just ignore wrong len?? or raise bad file exception?
    if ((INT64)len + save + 8LL > fsize)
      return; // just ignore out of file metadata, stop parse
    switch (tag)
    {
    case 0x505244: /* PRD */
      fseek(ifp, 8, SEEK_CUR);
      high = get2();
      wide = get2();
      imSony.prd_ImageHeight = get2();
      imSony.prd_ImageWidth = get2();
      imSony.prd_Total_bps = (ushort)fgetc(ifp);
      imSony.prd_Active_bps = (ushort)fgetc(ifp);
      imSony.prd_StorageMethod = (ushort)fgetc(ifp);
      fseek(ifp, 4L, SEEK_CUR);
      imSony.prd_BayerPattern = (ushort)fgetc(ifp);
      break;
    case 0x524946: /* RIF */
      fseek(ifp, 8, SEEK_CUR);
      icWBC[LIBRAW_WBI_Tungsten][0] = get2();
      icWBC[LIBRAW_WBI_Tungsten][2] = get2();
      icWBC[LIBRAW_WBI_Daylight][0] = get2();
      icWBC[LIBRAW_WBI_Daylight][2] = get2();
      icWBC[LIBRAW_WBI_Cloudy][0] = get2();
      icWBC[LIBRAW_WBI_Cloudy][2] = get2();
      icWBC[LIBRAW_WBI_FL_W][0] = get2();
      icWBC[LIBRAW_WBI_FL_W][2] = get2();
      icWBC[LIBRAW_WBI_Flash][0] = get2();
      icWBC[LIBRAW_WBI_Flash][2] = get2();
      icWBC[LIBRAW_WBI_Custom][0] = get2();
      icWBC[LIBRAW_WBI_Custom][2] = get2();
      icWBC[LIBRAW_WBI_Tungsten][1] = icWBC[LIBRAW_WBI_Tungsten][3] =
        icWBC[LIBRAW_WBI_Daylight][1] = icWBC[LIBRAW_WBI_Daylight][3] =
        icWBC[LIBRAW_WBI_Cloudy][1] = icWBC[LIBRAW_WBI_Cloudy][3] =
        icWBC[LIBRAW_WBI_FL_W][1] = icWBC[LIBRAW_WBI_FL_W][3] =
        icWBC[LIBRAW_WBI_Flash][1] = icWBC[LIBRAW_WBI_Flash][3] =
        icWBC[LIBRAW_WBI_Custom][1] = icWBC[LIBRAW_WBI_Custom][3] = 0x100;
      if (!strncasecmp(model, "DSLR-A100", 9)) {
        icWBC[LIBRAW_WBI_Shade][0] = get2();
        icWBC[LIBRAW_WBI_Shade][2] = get2();
        icWBC[LIBRAW_WBI_FL_D][0] = get2();
        icWBC[LIBRAW_WBI_FL_D][2] = get2();
        icWBC[LIBRAW_WBI_FL_N][0] = get2();
        icWBC[LIBRAW_WBI_FL_N][2] = get2();
        icWBC[LIBRAW_WBI_FL_WW][0] = get2();
        icWBC[LIBRAW_WBI_FL_WW][2] = get2();
        icWBC[LIBRAW_WBI_Shade][1] = icWBC[LIBRAW_WBI_Shade][3] =
          icWBC[LIBRAW_WBI_FL_D][1] = icWBC[LIBRAW_WBI_FL_D][3] =
          icWBC[LIBRAW_WBI_FL_N][1] = icWBC[LIBRAW_WBI_FL_N][3] =
          icWBC[LIBRAW_WBI_FL_WW][1] = icWBC[LIBRAW_WBI_FL_WW][3] = 0x0100;
      }
      break;
    case 0x574247: /* WBG */
      get4();
      if (imSony.prd_BayerPattern == LIBRAW_MINOLTA_G2BRG1)
        FORC4 cam_mul[G2BRG1_2_RGBG(c)] = get2();
      else
      	FORC4 cam_mul[RGGB_2_RGBG(c)] = get2();
      break;
    case 0x545457: /* TTW */
      parse_tiff(ftell(ifp));
      data_offset = offset;
    }
    fseek(ifp, save + len + 8, SEEK_SET);
  }
  raw_height = high;
  raw_width = wide;
  order = sorder;
}